package com.zj;

import java.util.HashSet;
import java.util.Set;

/**
 * Hello world!
 *
 */
public class App 
{
    public static void main( String[] args )
    {
        Set<String> aa=new HashSet<>();
        String[] arr=aa.toArray(new String[6]);
        System.out.println( "Hello World!" );
    }
}
